Decouple chat from core and add chat rest api (#25)

* Decouple the chat package from the core

* Add rest api endpoints for the chat aspect

models/chatListener.go

@@ -0,0 +1,8 @@
+package models
+
+//ChatListener represents the listener for the chat server
+type ChatListener interface {
+	ClientAdded(clientID string)
+	ClientRemoved(clientID string)
+	MessageSent(message ChatMessage)
+}

models/chatMessage.go

@@ -2,6 +2,8 @@ package models
 
 //ChatMessage represents a single chat message
 type ChatMessage struct {
+	ClientID string `json:"-"`
+
 	Author      string `json:"author"`
 	Body        string `json:"body"`
 	Image       string `json:"image"`
@@ -14,3 +16,8 @@ type ChatMessage struct {
 func (s ChatMessage) String() string {
 	return s.Author + " says " + s.Body
 }
+
+//Valid checks to ensure the message is valid
+func (s ChatMessage) Valid() bool {
+	return s.Author != "" && s.Body != "" && s.ID != ""
+}